Cube of 729

A cube number is a value obtained by raising a number to the power of 3, or by multiplying the number by itself three times. When you cube a positive number, the result is always positive. When you cube a negative number, the result is always negative. This is because a negative number by itself three times results in a negative number.

The cube of 729 can be written as 729³, which is the exponential form. Or it can also be written in arithmetic form as, 729 × 729 × 729.

In order to check whether a number is a cube number or not, we can use the following three methods, such as multiplication method, a factor formula (a³), or by using a calculator. These three methods will help in cubing the numbers faster and easier without feeling confused or stuck while evaluating the answers.

1. By Multiplication Method
2. Using a Formula
3. Using a Calculator

The multiplication method is a process in mathematics used to find the product of numbers or quantities by combining them through repeated addition. It is a fundamental operation that forms the basis for more complex mathematical concepts.

Step 1: Write down the cube of the given number.729³ = 729 × 729 × 729

Step 2: You get 387,420,489 as the answer.         

Hence, the cube of 729 is 387,420,489.

The formula (a + b)³ is a binomial formula for finding the cube of a number. The formula is expanded as a³ + 3a²b + 3ab² + b³.

Step 1: Split the number 729 into two parts.         Let a = 700 and b = 29, so a + b = 729

Step 2: Now, apply the formula (a + b)³ = a³ + 3a²b + 3ab² + b³

Step 3: Calculate each term         

a³ = 700³        

 3a²b = 3 × 700² × 29         

3ab² = 3 × 700 × 29²       

b³ = 29³

Step 4: Add all the terms together:  

(a + b)³ = a³ + 3a²b + 3ab² + b³  

(700 + 29)³ = 700³ + 3 × 700² × 29 + 3 × 700 × 29² + 29³        

 729³ = 343,000,000 + 42,630,000 + 17,661,000 + 24,389        

 729³ = 387,420,489

Step 5: Hence, the cube of 729 is 387,420,489.

To find the cube of 729 using a calculator, input the number 729 and use the cube function (if available) or multiply 729 × 729 × 729. This operation calculates the value of 729³, resulting in 387,420,489. It’s a quick way to determine the cube without manual computation.

Step 1: Ensure the calculator is functioning properly.

Step 2: Press 7 followed by 2 and 9

Step 3: If the calculator has a cube function, press it to calculate 729³.

Step 4: If there is no cube function on the calculator, simply multiply 729 three times manually.

Step 5: The calculator will display 387,420,489.

• The cube of any even number is always even, while the cube of any odd number is always odd.

• The product of two or more perfect cube numbers is always a perfect cube.

• A perfect cube can always be expressed as the product of three identical groups of equal prime factors.

• Binomial Formula: It is an algebraic expression used to expand the powers of a number, written as (a + b)ⁿ, where ‘n’ is a positive integer raised to the base. The formula is used to find the square and cube of a number.

• Cube of a Number: Multiplying a number by itself three times is called the cube of a number.

• Exponential Form: It is a way of expressing numbers using a base and an exponent (or power), where the exponent value indicates how many times the base is multiplied by itself. For example, 2³ represents 2 × 2 × 2 equals 8.

• Perfect Cube: A number that can be expressed as the cube of an integer is called a perfect cube.

• Cube Root: A number that, when multiplied by itself three times, gives the original number is the cube root of that number.